I have teh awnser!
This relates back to the days when ISA was the norm and PCI was new. ISA cards sat the right way up, the decsion was made to turn PCI around so that an ISA slot and a PCI slot could share the same case slot, so you could have an extra slot, it was up to you which (if any) you used.
AMD Athlon 64 3500+ Venice (skt938), ABit AN8-SLI Mobo, nVidia GeForce 6600 GT, 1Gb Crucial PC3200 DDR Memory, 160Gb Hitachi 7K250, NEC 16x DL DVD/RW, Coolermaster Centuron Case, Tegan PSU,
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